While explaining why it is Apple will no longer officially participate in future MacWorld Expos, marketing executive and ‘09 keynote speaker Phil Schiller enumerated a loose calendar of product refresh cycles the company would like to stick to going forward.

According to Schiller, Apple’s product release cycles are as follows: “the iPod product cycle (October), the iLife development cycle (usually March), the iPhone cycle (June).”  January – the month in which the Expo has been held – does not fit into this schedule.

The last two iPhones – the original and 3G models – were each released in June, and iPods are usually released around September or October, so these dates aren’t exactly a revelation.  But it is worth noting that in laying out Apple’s refresh cycle in this way, Schiller all but confirmed that iPhone 3.0, or a new iPhone model altogether, will arrive this summer.  iPhone nano, anyone?

We’re looking forward to it.